C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Fuel Pump

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Old Apr 16, 2003 | 05:56 PM
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markd79ta's Avatar
markd79ta
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Default Fuel Pump

How difficult is it to change the fuel pump on an '86?
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Old Apr 16, 2003 | 06:19 PM
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Default Re: Fuel Pump (markd79ta)

very easy...just did mine. Remove the gas door and the black tub around the filler neck. Mine had a plate with the filler neck bolted to the tank with about 8 bolts. Remove those, and the whole unit comes out as one piece. The fuel pump is at the bottom. Unplug it from the harness, push up and in, then down and out, and the fuel pump should come off the unit. Replacing the new ump is just the opposite. Remember to replace the sock filter on the bottom of the pump, and notice the orientation of the filter when you take the old one off. My bolts had o-rings on them to seal them...
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Old Apr 16, 2003 | 06:56 PM
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Mike's 86
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Default Re: Fuel Pump (mk842766)

very easy...just did mine. Remove the gas door and the black tub around the filler neck. Mine had a plate with the filler neck bolted to the tank with about 8 bolts. Remove those, and the whole unit comes out as one piece. The fuel pump is at the bottom. Unplug it from the harness, push up and in, then down and out, and the fuel pump should come off the unit. Replacing the new ump is just the opposite. Remember to replace the sock filter on the bottom of the pump, and notice the orientation of the filter when you take the old one off. My bolts had o-rings on them to seal them...
:iagree: But when I did mine the ground lead was a little different so a little soldering was needed.
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Old Apr 16, 2003 | 06:58 PM
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Default Thank You!!!!!

I am so grateful that I don't have to drop the tank!
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Old Apr 16, 2003 | 07:12 PM
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Default Re: Fuel Pump (mk842766)

very easy...just did mine. Remove the gas door and the black tub around the filler neck. Mine had a plate with the filler neck bolted to the tank with about 8 bolts. Remove those, and the whole unit comes out as one piece. The fuel pump is at the bottom. Unplug it from the harness, push up and in, then down and out, and the fuel pump should come off the unit. Replacing the new ump is just the opposite. Remember to replace the sock filter on the bottom of the pump, and notice the orientation of the filter when you take the old one off. My bolts had o-rings on them to seal them...
I took mine out to replace the sock filter and clean the tank. Entire process took less than 30 mins.
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Old Apr 21, 2003 | 04:21 AM
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From: Sacramento, CA Money can't buy happiness - but it's more comfortable to cry in a Corvette than a Yugo.
Default Re: Thank You!!!!! (markd79ta)

You don't absolutely have to get a new sending unit rubber gasket, but I recommend it. The gasket is not expensive and if your pump is original the old gasket may distort or tear on removal. The gasket has a notch in the upper right corner. Be sure to put it back that way. It will go on incorrectly with no problem, until you find a ton of water in your tank a year later when you do this again. (I know from experience.)

When you get the rubber sending unit gasket pick up a two or three new sending unit hold-down bolts with o-rings. There are 9 total. Most likely you will have one or two of the originals that have bad o-rings or some rust on the bolts. Replace the worst ones with the new ones.

As already mentioned, be sure to note the direction of the sock filter on the bottom of the fuel pump when you pull it out. You want to put the new one on in the same direction thet the old one was.
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